remote: simplify the architecture
1. Deprecate netlink over TCP 2. The remote netlink server works via 2 files (pipes) 3. Affected: NetNS From now on it is possible to communicate with the remote netlink via 2 file channels, like stdin/stdout. Files must support the basic file API — read/write/close/flush. The `Server()` routine takes 2 files wrapped in the `Transport` protocol (see NetNS implementation).
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